CN114976499B

CN114976499B - Battery cell connecting assembly and battery module

Info

Publication number: CN114976499B
Application number: CN202210586742.1A
Authority: CN
Inventors: 陈剑伟; 李水源; 李明会; 薛彤
Original assignee: Farasis Energy Ganzhou Co Ltd; Farasis Energy Zhenjiang Co Ltd
Current assignee: Farasis Energy Ganzhou Co Ltd; Farasis Energy Zhenjiang Co Ltd
Priority date: 2022-05-27
Filing date: 2022-05-27
Publication date: 2024-05-17
Anticipated expiration: 2042-05-27
Also published as: CN114976499A

Abstract

The disclosure provides a battery cell connecting assembly and a battery module, and belongs to the technical field of battery modules, wherein the battery cell connecting assembly comprises a first enclasping structure, a second enclasping structure and a connecting structure, and the first enclasping structure and the second enclasping structure are electrically connected through the connecting structure; the first enclasping structure and the second enclasping structure both comprise a fixed part and a movable part; the first end of fixed part is connected with connection structure, and the second end of fixed part and the first end swing joint of movable part, the second end of movable part can be when holding tightly the state, with the first end direct connection or indirect connection of fixed part, and form annular space when the second end of movable part is connected with the first end of fixed part to hold tightly electric core post. The embodiment of the disclosure can reduce the maintenance efficiency and cost of the battery cells while meeting the better conductive connection effect between the battery cells.

Description

Battery cell connecting assembly and battery module

Technical Field

The disclosure belongs to the technical field of battery modules, and particularly relates to a battery cell connecting assembly and a battery module.

Background

With the vigorous development of new energy industries, the requirements of battery systems, such as higher battery energy density (i.e., battery modules) and higher safety of the battery modules, are increasing. The battery module is formed by connecting a plurality of battery cells in series and parallel, the battery cells are connected in series and parallel through electric connecting pieces, most of the current electric connecting pieces are simple metal sheets, and the current electric connecting pieces are welded between two battery cell polar columns through the metal sheets. But the simple metal sheet and the battery core are electrically connected to form a smaller overcurrent area, so that the charge and discharge efficiency of the battery module is affected. In addition, the mode of utilizing the sheetmetal welded connection two electric cores is not firm, causes the phenomenon of unwelding easily to cost of maintenance is higher, and probably causes the harm to other electric cores in the maintenance process, can't carry out the maintenance of single electric core even, only can replace whole battery module, has further improved battery cost of maintenance.

Disclosure of Invention

The utility model discloses an at least one of the technical problem that exists among the solution prior art provides a electric core coupling assembling and battery module, when satisfying better electrically conductive connection effect between the electric core, can reduce electric core maintenance efficiency and cost.

In a first aspect, a technical solution adopted to solve the technical problem of the present disclosure is a battery core connection assembly, which includes a first enclasping structure, a second enclasping structure, and a connection structure, where the first enclasping structure and the second enclasping structure are electrically connected through the connection structure; the first enclasping structure and the second enclasping structure both comprise a fixed part and a movable part;

The first end of the fixed part is connected with the connecting structure, the second end of the fixed part is movably connected with the first end of the movable part, the second end of the movable part can be directly connected or indirectly connected with the first end of the fixed part in a clasping state, and an annular space is formed when the second end of the movable part is connected with the first end of the fixed part so as to clasp the battery core polar column.

In some examples, the movable component includes a face connection and at least one branch; the first end of the surface connecting part is movably connected with the second end of the fixing part; the second end of the surface connecting part is fixedly connected with the first end of each branching part; the second end of each branch part can be directly or indirectly connected with the first end of the fixing part in a clasping state, and an annular space is formed when the second end of each branch part is connected with the first end of the fixing part so as to clasp the battery core polar column.

In some examples, the thickness of the branch is between 0.5mm and 1.5 mm.

In some examples, the first hug structure and the second hug structure each further comprise a first connection member; the second end of the fixed part is movably connected with the first end of the movable part through the first connecting part.

In some examples, the second end of the movable component includes a first detent structure and the first end of the fixed component includes a second detent structure that mates with the first detent structure; in the clasping state, the first clamping groove structure is directly connected with the second clamping groove structure; or alternatively

The first enclasping structure further comprises a second connecting part; the second end of the movable part can be indirectly connected with the first end of the fixed part through the second connecting part in a clasping state.

In some examples, the second connection component comprises a pin.

In some examples, the connection structure is a unitary structure with the stationary component.

In some examples, a non-conductor component is also included; the non-conductor component includes a through hole;

The connecting structure is connected with the fixing part through one penetrating hole.

In a second aspect, embodiments of the present disclosure further provide a battery module, including at least two battery cells, and the battery cell connection assembly of any one of the first aspects; and two adjacent electric cores form electric conduction through the electric core connecting assembly.

In some examples, the electrical cell includes a cell post; the battery core electrode post is provided with a notch;

The battery cell connecting assembly comprises a first enclasping structure, a second enclasping structure and a connecting structure; the first enclasping structure and the second enclasping structure are electrically connected through the connecting structure; the first enclasping structure and the second enclasping structure both comprise a fixed part and a movable part;

The first end of the fixed part is connected with the connecting structure, the second end of the fixed part is movably connected with the first end of the movable part, the second end of the movable part can be directly connected or indirectly connected with the first end of the fixed part through the notch when in a clasping state, and an annular space is formed when the second end of the movable part is connected with the first end of the fixed part so as to clasp the battery core pole.

Drawings

Fig. 1a is a top view of a cell connection assembly provided by an embodiment of the present disclosure;

Fig. 1b is a front view of a battery cell connection assembly provided by an embodiment of the present disclosure;

FIG. 2 is a schematic illustration of a specific structure of a movable member according to an embodiment of the present disclosure;

FIG. 3 is a schematic illustration of a specific structure of a fixing member according to an embodiment of the present disclosure;

FIG. 4 is a schematic illustration of a movable connection between a stationary component and a movable component provided by an embodiment of the present disclosure;

FIG. 5 is a schematic connection diagram of a second connection component provided in an embodiment of the present disclosure;

fig. 6 is a schematic view of a battery module according to an embodiment of the present disclosure;

Fig. 7 is a schematic diagram of a cell structure provided in an embodiment of the disclosure;

Fig. 8 is a schematic side plate structure of a battery module according to an embodiment of the present disclosure.

Detailed Description

In order that those skilled in the art will better understand the technical solutions of the present disclosure, the present disclosure will be described in further detail with reference to the accompanying drawings and detailed description.

Unless defined otherwise, technical or scientific terms used in this disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," and the like, as used in this disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Likewise, the terms "a," "an," or "the" and similar terms do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.

In a first aspect, fig. 1a is a top view of a battery cell connection assembly provided in an embodiment of the disclosure, and fig. 1b is a front view of the battery cell connection assembly provided in an embodiment of the disclosure, where, as shown in fig. 1a and 1b, the battery cell connection assembly 100 includes a first enclasping structure 11, a second enclasping structure 12, and a connection structure 13. The first and second clasping structures 11 and 12 may be electrically connected by a connecting structure 13.

The first enclasping structure 11 and the second enclasping structure 12 each include a fixed part 21 (including a fixed part 211 and a fixed part 212) and a movable part 22 (including a movable part 221 and a movable part 222), wherein 211 represents the fixed part of the first enclasping structure 11, 212 represents the fixed part of the second enclasping structure 12, 221 represents the movable part of the first enclasping structure 11, and 222 represents the movable part of the second enclasping structure 12.

The first end A (including A1 and A2) of the fixed part 21 is connected with the connecting structure 13, the second end B (including B1 and B2) of the fixed part 21 is movably connected with the first end C (including C1 and C2) of the movable part 22, the second end D (including D1 and D2) of the movable part 22 can be directly connected or indirectly connected with the first end A of the fixed part 21 in a clasping state, and an annular space is formed when the second end D of the movable part 22 is connected with the first end A of the fixed part 21 so as to clasp the battery core pole 14.

For the first enclasping structure 11, the first end A1 of the fixed part 211 is connected with the first end E of the connecting structure 13, the second end B1 of the fixed part 211 is movably connected with the first end C1 of the movable part 221, the second end D1 of the movable part 221 can be directly connected or indirectly connected with the first end A1 of the fixed part 211 in an enclasping state, and an annular space is formed when the second end D1 of the movable part 221 is connected with the first end A1 of the fixed part 211 so as to enclasp the first electric core pole.

For the second enclasping structure 12, the first end A2 of the fixed component 212 is connected with the second end F of the connecting structure 13, the second end B2 of the fixed component 212 is movably connected with the first end C2 of the movable component 222, the second end D2 of the movable component 222 can be directly connected or indirectly connected with the first end A2 of the fixed component 212 in the enclasping state, and an annular space is formed when the second end D2 of the movable component 222 is connected with the first end A2 of the fixed component 212 so as to enclasp the second electric core pole.

According to the embodiment of the disclosure, the annular space formed by the first enclasping structure 11 and the annular space formed by the second enclasping structure 12 enclasping the first battery cell pole and the second battery cell pole respectively, and good conductive connection between the two battery cells is realized by utilizing the connecting component 13, and the overcurrent area between the battery cell connecting component 100 and the battery cell pole 14 can be improved by the annular space formed by the enclasping structure, so that the charge and discharge efficiency of the battery module is improved; in addition, the second end D of the movable member 22 is directly or indirectly connected to the first end of the fixed member in the clasping state, and is easy to detach in the cell maintenance state, so that the cell can be replaced in a targeted manner, the maintenance cost is saved, the maintenance efficiency is high, and the safety is high.

The first holding structure 11 and the second holding structure 12 are the same, and the following holding structure refers to any one of the first holding structure 11 and the second holding structure 12.

In some examples, fig. 2 is a schematic diagram of a specific structure of a movable component provided in an embodiment of the disclosure, and as shown in fig. 2, the movable component 22 includes a face connection portion 22a and at least one branching portion 22b; the first end C of the surface connecting part 22a is movably connected with the second end B of the fixed part 21; the second end G1 of the face connecting portion 22a is fixedly connected to the first end G2 of each branch portion 22b; the second end D of each branch portion 22b can be directly or indirectly connected to the first end a of the fixing member 21 in the clasping state, and the second end D of each branch portion 22b forms an annular space when connected to the first end a of the fixing member 21, so as to clasp the electrical terminal 14.

The surface connecting portion 22a and the branching portion 22b are integrally formed. Or the face connection 22a and the branch 22b are welded or connected by other connectors.

In some examples, fig. 3 is a schematic specific structure of a fixing member provided in an embodiment of the present disclosure, and as shown in fig. 3, the fixing member 21 is a surface connection member, and the surface connection member has the same structure as the surface connection portion 22a in the movable member 22.

The cell terminal 14 includes a side, an upper bottom, and a lower bottom. When the enclasping structure is in an enclasping state, the fixing part 21 is a first part annular wall of the annular space and is clung to the side surface of the battery core pole 14 in the length direction of the battery core pole 14; the surface connection part 22a is a second part annular wall of the annular space and is clung to the side surface of the battery core pole 14; each branch 22b is a third partial annular wall of the annular space and abuts the side of the cell terminal 14.

The disclosed embodiment can ensure a relatively high electrical connection area between the fixed member 21 and the movable member 22 and the cell terminal 14, that is, increase the overcurrent (current path) area between the cells, by using the surface connection portions 22a in the fixed member 21 (surface connection portions 22 a).

In some examples, the branch 22b may comprise a thin metal sheet, and the thickness of the branch 22b may be between 0.5mm-1.5 mm.

In some examples, in order to ensure that the first and second enclasping structures 11 and 12 are tightly connected to the cell terminal 14, a plurality of branches 22b may be provided to increase the connection strength. The number of the branch portions 22b may be set according to the actual application scenario and experience, and the embodiment of the present disclosure is not particularly limited. The plurality of branch portions 22b may be arranged in an array along the side longitudinal direction of the fixed member 21 or the movable member 22, and the second ends D of the plurality of branch portions 22b may be located on the same axis in the side longitudinal direction of the fixed member 21 or the movable member 22.

Further, the branch portion 22b may be made of a metal material with better toughness, so that when the second end D of the branch portion 22b is connected to the first end a of the fixed member 21, the fixed member 21 and the movable member 22 can be tightly attached to the cell terminal 14, and the connection strength is further improved.

In some examples, the first and second clasping structures 11 and 12 each further comprise a first connection member 111; the second end B of the fixed member 21 is movably connected to the first end C of the movable member 22 via the first connecting member 111. The movable part 22 is detachable from the fixed part 21. The movable member 22 is rotatable about the first connecting member 111. The first connecting member 111 is assembled in a direction consistent with the side longitudinal direction of the fixed member 21 or the movable member 22.

The first connection part 111 comprises a hinge or a pin. Fig. 4 is a schematic view of movable connection between a fixed component and a movable component according to an embodiment of the present disclosure, as shown in fig. 4, the first connecting component 111 is a hinge, and includes a first connecting body 111a (see fig. 3) and a second connecting body 111b (see fig. 2). The first connecting body 111a is disposed on the fixing member 21 and located at the second end B of the fixing member 21, and the first connecting body 111a is a hollow cylinder; the second connecting body 111b is disposed on the movable member 22 and located at the first end C of the movable member 22 (i.e. the first end C of the surface connecting portion 22 a), and the second connecting body 111 has a smaller radius than the hollow radius of the hollow cylinder. The second connector 111B may be inserted into the first connector 111a to movably connect the second end B of the fixed member 21 with the first end C of the movable member 22.

In some examples, the first connection member 111 is a pin. The fixing part 21 includes a first connection hole at a second end B of the fixing part 21; the movable member 22 includes a second coupling hole and is positioned at a first end C of the movable member 22 (i.e., a first end C of the face coupling portion 22 a). The pins pass through the first and second connection holes, respectively, to connect the movable part 22 and the fixed part 21.

In some examples, the second end D of the movable member 22 includes a first detent structure and the first end a of the fixed member 21 includes a second detent structure that mates with the first detent structure; when in a hugging state, the first clamping groove structure is directly connected with the second clamping groove structure.

Specifically, the movable component 22 includes a branch portion 22b, and the first clamping groove structure may be disposed at the second end D of the branch portion 22b, and in the clasping state, the first clamping groove structure of the branch portion 22b and the second clamping groove structure of the first end a of the fixed component 21 are concentrically overlapped, and then are serially connected and fixed by using pins, so as to implement a clamping connection, or a mutually hooked lock is implemented.

In some examples, fig. 5 is a schematic connection diagram of a second connection component provided in an embodiment of the present disclosure, as shown in fig. 5, where each of the first enclasping structure 11 and the second enclasping structure 12 further includes a second connection component 112; the second end D of the movable member 22 can be indirectly connected to the first end a of the fixed member 21 via the second connecting member 112 in the clasped state.

Specifically, the movable member 22 includes a branch portion 22b, at a second end D of the branch portion 22b, provided with a first via hole 220 in a thickness direction thereof; at the first end a of the fixing member 21, a second via hole 210 is provided in the thickness direction thereof; in the clasping state, the second connecting member 112 passes through the first via hole 220 and the second via hole 210 to connect the movable member 22 and the fixed member 21.

The second connection member 112 may include, but is not limited to, a pin.

In some examples, as shown in fig. 1a, the connection structure 13 is of unitary construction with the fixation components (including fixation component 211 and fixation component 212). Specifically, the first end E of the connecting structure 13 is connected with the first end A1 of the fixing member 211 as an integral structure; the second end F of the connecting structure 13 is connected to the first end A2 of the fixing member 212 as a unitary structure.

Of course, instead of providing the connection structure 13 and the fixing member as a unitary structure, it is also possible to provide that the first end E of the connection structure 13 is welded to the first end A1 of the fixing member 211 and the second end F of the connection structure 13 is welded to the first end A2 of the fixing member 212.

It should be noted that the connection structure 13 may be a surface connection structure to increase the overcurrent area between the first cell terminal and the second cell terminal.

In some examples, the materials of the first enclasping structure 11, the second enclasping structure 12, and the connecting structure 13 are all metallic conductive materials.

In some examples, as shown in fig. 1a and 1b, the cell connection assembly further comprises a non-conductor member 15; the non-conductor member 15 includes a through hole; the connection structure 13 is connected to the fixing member 21 by a penetration hole.

The non-conductor component may be a plastic part, the material of which is a non-conductive material.

After the first enclasping structure 11, the second enclasping structure 12, and the connecting structure 13 are assembled, the non-conductive member 15 is formed by an injection molding process, and at this time, the connecting structure 13 is embedded in the non-conductive member 15 through the penetration hole.

In a second aspect, an embodiment of the present disclosure further provides a battery module, and fig. 6 is a schematic diagram of the battery module provided in the embodiment of the present disclosure. As shown in fig. 6, the battery module 600 includes at least two battery cells 101, and the battery connection assembly 100 of any one of the first aspect. Adjacent two of the cells 101 are electrically connected by the battery connection assembly 100.

The embodiment of the disclosure utilizes the battery connection assembly 100 provided in the first aspect to realize electrical conduction between the two electric cores 101, that is, the annular space formed by the first enclasping structure 11 and the annular space formed by the second enclasping structure 12 enclasping the first electric core pole and the second electric core pole respectively, and utilizes the connection component 13 to realize better conductive connection between the two electric cores 101. In addition, the second end D of the movable member 22 is directly or indirectly connected to the first end a of the fixed member 21 in the clasping state, and is easy to detach in the cell maintenance state, so that the cell can be replaced in a targeted manner, the maintenance cost is saved, the maintenance efficiency is high, and the safety is high.

In some examples, fig. 7 is a schematic diagram of a hugging structure and a cell assembly provided in an embodiment of the present disclosure, and as shown in fig. 2 and fig. 7, the movable component 22 includes a face connection portion 22a and at least one branching portion 22b. When the branch portion 22b includes a plurality of branch portions 22b, the plurality of branch portions 22b are arranged in an array along the axial direction of the cell post 14. The cell 101 includes a cell post 14; the cell terminal 14 is provided with a notch 141. The number of the notches 141 is the same as that of the branch portions 22b, and is correspondingly set. The notch 141 is formed in the battery core pole 14, the battery connecting assembly 110 and the battery core pole 14 are tightly held by the aid of the cooperation of the branch portion 22b and the notch 141, the battery core can be easily detached in a battery core maintenance state, the battery core can be replaced in a targeted mode, maintenance cost is saved, maintenance efficiency is high, and safety is high.

As shown in fig. 1a and 1b, the cell connection assembly 100 includes a first enclasping structure 11, a second enclasping structure 12, and a connection structure 13; the first enclasping structure 11 and the second enclasping structure 12 are electrically connected through a connecting structure 13; the first and second clasping structures 11 and 12 each include a fixed member 21 and a movable member 22.

Taking any one of the first enclasping structure 11 and the second enclasping structure 12 as an example, the first end a of the fixed component 21 is connected with the connecting structure 13, the second end B of the fixed component 21 is movably connected with the first end C of the movable component 22, the second end D of the movable component 22 can be directly connected or indirectly connected with the first end a of the fixed component 21 through the notch 72 in the enclasping state, and an annular space is formed when the second end D of the movable component 22 is connected with the first end a of the fixed component 21 so as to enclasp the electric core pole.

Specifically, the notch 141 includes an inlet 141a and an outlet 141b. The second end D of the movable part 22 can pass through the inlet 141a and the outlet 141b in the clasped state, and be directly or indirectly connected to the first end a of the fixed part 21.

In some examples, fig. 8 is a schematic side plate structure of a battery module according to an embodiment of the present disclosure, and as shown in fig. 8, a battery module 600 includes a side plate 61, and a fixing groove 62 is provided on the side plate 61 for fixing the battery cell connection assembly 100.

In some examples, fig. 9 is an assembly schematic diagram of a battery cell provided in an embodiment of the disclosure, as shown in fig. 9, the battery cell module 600 further includes an end plate 63 and a bottom plate 64, and the bottom plate 64 is provided with a groove 65 for fixing the battery cell 101.

The end plate 63 and the bottom plate 64 are provided as an integral structure, which can simplify the assembly process and provide assembly efficiency.

The cell module 600 also includes a platen 66 for holding and compressing the plurality of cells 101.

It is to be understood that the above embodiments are merely exemplary embodiments employed to illustrate the principles of the present disclosure, however, the present disclosure is not limited thereto. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the disclosure, and are also considered to be within the scope of the disclosure.

Claims

1. The battery cell connecting assembly comprises a first enclasping structure, a second enclasping structure and a connecting structure, wherein the first enclasping structure and the second enclasping structure are electrically connected through the connecting structure; the first enclasping structure and the second enclasping structure comprise a fixed part, a movable part and a first connecting part;

The first end of the fixed part is connected with the connecting structure, the second end of the fixed part is movably connected with the first end of the movable part through the first connecting part, the movable part can rotate around the first connecting part, and the assembling direction of the first connecting part is consistent with the length direction of the side face of the fixed part;

The second end of the movable part can be directly connected with the first end of the fixed part or indirectly connected through a second connecting part in a clasping state so as to realize the detachable connection between the second end of the movable part and the first end of the fixed part; and the second end of the movable part is connected with the first end of the fixed part to form an annular space so as to hold the battery core pole of one battery core tightly.

2. The cell connection assembly of claim 1, wherein the movable member comprises a face connection portion and at least one branch portion; the first end of the surface connecting part is movably connected with the second end of the fixing part; the second end of the surface connecting part is fixedly connected with the first end of each branching part; the second end of each branch part can be directly or indirectly connected with the first end of the fixing part in a clasping state, and an annular space is formed when the second end of each branch part is connected with the first end of the fixing part so as to clasp the battery core polar column.

3. The cell connection assembly of claim 2, wherein the thickness of the branch is between 0.5mm and 1.5 mm.

4. The cell connection assembly of claim 1, wherein the first and second hug structures each further comprise a first connection member; the second end of the fixed part is movably connected with the first end of the movable part through the first connecting part.

5. The electrical cell connection assembly of claim 1, wherein the second end of the movable member comprises a first detent structure and the first end of the stationary member comprises a second detent structure that mates with the first detent structure; in the clasping state, the first clamping groove structure is directly connected with the second clamping groove structure; or alternatively

6. The cell connection assembly of claim 5, wherein the second connection member comprises a pin.

7. The cell connection assembly of claim 1, wherein the connection structure is of unitary construction with the stationary component.

8. The cell connection assembly of claim 1 or 7, further comprising a non-conductor component; the non-conductor component includes a through hole;

9. A battery module comprising at least two cells, and the cell connection assembly of any one of claims 1-8; and two adjacent electric cores form electric conduction through the electric core connecting assembly.

10. The battery module of claim 9, wherein the cells comprise cell posts; the battery core electrode post is provided with a notch;